diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5d19981..fbb6828 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -37,7 +37,7 @@
     <ConfirmationsSetting value="0" id="Add" />
     <ConfirmationsSetting value="0" id="Remove" />
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" default="true" assert-keyword="true" jdk-15="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" assert-keyword="true" jdk-15="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">
diff --git a/app/src/main/java/tu_darmstadt/sudoku/controller/SaveLoadStatistics.java b/app/src/main/java/tu_darmstadt/sudoku/controller/SaveLoadStatistics.java
index 3d35999..897f704 100644
--- a/app/src/main/java/tu_darmstadt/sudoku/controller/SaveLoadStatistics.java
+++ b/app/src/main/java/tu_darmstadt/sudoku/controller/SaveLoadStatistics.java
@@ -57,8 +57,12 @@ public class SaveLoadStatistics {
                 Log.e("Failed to read file","File could not be read");
             }
             infos = new HighscoreInfoContainer(t,dif);
+            try {
             infos.setInfosFromFile(new String(bytes));
-            result.add(infos);
+            } catch (IllegalArgumentException e){
+                file.delete();
+            }
+                result.add(infos);
         }
 
 
diff --git a/app/src/main/java/tu_darmstadt/sudoku/ui/MainActivity.java b/app/src/main/java/tu_darmstadt/sudoku/ui/MainActivity.java
index be15ffe..58beb21 100644
--- a/app/src/main/java/tu_darmstadt/sudoku/ui/MainActivity.java
+++ b/app/src/main/java/tu_darmstadt/sudoku/ui/MainActivity.java
@@ -3,6 +3,10 @@ package tu_darmstadt.sudoku.ui;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.preference.PreferenceManager;
+import android.support.design.widget.NavigationView;
+import android.support.v4.view.GravityCompat;
+import android.support.v4.widget.DrawerLayout;
+import android.support.v7.app.ActionBarDrawerToggle;
 import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
 
@@ -12,6 +16,7 @@ import android.support.v4.app.FragmentPagerAdapter;
 import android.support.v4.view.ViewPager;
 import android.os.Bundle;
 import android.view.LayoutInflater;
+import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 
@@ -31,7 +36,7 @@ import tu_darmstadt.sudoku.game.GameDifficulty;
 import tu_darmstadt.sudoku.game.GameType;
 import tu_darmstadt.sudoku.ui.view.R;
 
-public class MainActivity extends AppCompatActivity {
+public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener{
 
     RatingBar difficultyBar;
     TextView difficultyText;
@@ -104,6 +109,18 @@ public class MainActivity extends AppCompatActivity {
         editor.putBoolean("savesChanged", true);
         editor.apply();
         refreshContinueButton();
+
+
+        // set Nav_Bar
+        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout_main);
+        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
+                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
+        drawer.setDrawerListener(toggle);
+        toggle.syncState();
+
+        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view_main);
+        navigationView.setNavigationItemSelectedListener(this);
+
     }
 
     public void onClick(View view) {
@@ -179,6 +196,46 @@ public class MainActivity extends AppCompatActivity {
         }
     }
 
+    @Override
+    public boolean onNavigationItemSelected(MenuItem item) {
+        // Handle navigation view item clicks here.
+        int id = item.getItemId();
+
+        Intent intent;
+
+        switch(id) {
+            case R.id.menu_settings_main:
+                //open settings
+                intent = new Intent(this,SettingsActivity.class);
+                startActivity(intent);
+                break;
+
+            case R.id.nav_highscore_main:
+                // see highscore list
+
+                intent = new Intent(this, StatsActivity.class);
+                startActivity(intent);
+                break;
+
+            case R.id.menu_about_main:
+                //open about page
+                intent = new Intent(this,AboutActivity.class);
+                startActivity(intent);
+                break;
+
+            case R.id.menu_help_main:
+                //open about page
+                //intent = new Intent(this,HelpActivity.class);
+                //startActivity(intent);
+                break;
+            default:
+        }
+
+        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout_main);
+        drawer.closeDrawer(GravityCompat.START);
+        return true;
+    }
+
     /*@Override
     public boolean onOptionsItemSelected(MenuItem item) {
         // Handle action bar item clicks here. The action bar will
diff --git a/app/src/main/res/layout/activity_game_view.xml b/app/src/main/res/layout/activity_game_view.xml
index 5066a4f..64bd721 100644
--- a/app/src/main/res/layout/activity_game_view.xml
+++ b/app/src/main/res/layout/activity_game_view.xml
@@ -9,9 +9,11 @@
         android:layout_height="match_parent" />
 
     <android.support.design.widget.NavigationView android:id="@+id/nav_view"
-        android:layout_width="wrap_content" android:layout_height="match_parent"
-        android:layout_gravity="start" android:fitsSystemWindows="true"
-        app:headerLayout="@layout/nav_header_game_view"
+        android:layout_width="200dp" android:layout_height="match_parent"
+        android:layout_gravity="start|start" android:fitsSystemWindows="true"
+        android:layout_marginTop="?attr/actionBarSize"
+        android:background="@color/lightblue"
         app:menu="@menu/menu_drawer" />
+    <!--app:headerLayout="@layout/nav_header_game_view"-->
 
 </android.support.v4.widget.DrawerLayout>
diff --git a/app/src/main/res/layout/activity_main_menu.xml b/app/src/main/res/layout/activity_main_menu.xml
index a2ab1b5..719e01e 100644
--- a/app/src/main/res/layout/activity_main_menu.xml
+++ b/app/src/main/res/layout/activity_main_menu.xml
@@ -1,14 +1,21 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.design.widget.CoordinatorLayout
+<android.support.v4.widget.DrawerLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     xmlns:app="http://schemas.android.com/apk/res-auto"
-    android:id="@+id/main_content"
     android:fitsSystemWindows="true"
+    android:id="@+id/drawer_layout_main"
     tools:context="tu_darmstadt.sudoku.ui.MainActivity"
     android:layout_height="match_parent"
+    android:layout_width="match_parent"
+    >
+<android.support.design.widget.CoordinatorLayout
+
+    android:id="@+id/main_content"
+    android:layout_height="match_parent"
     android:layout_width="match_parent">
 
+
     <android.support.design.widget.AppBarLayout
         android:id="@+id/appbar"
         android:layout_width="match_parent"
@@ -16,16 +23,18 @@
         android:theme="@style/AppTheme.AppBarOverlay">
 
         <android.support.v7.widget.Toolbar
-            android:id="@+id/toolbar"
-            android:layout_width="match_parent"
-            android:layout_height="?attr/actionBarSize"
-            android:background="?attr/colorPrimary"
-            app:popupTheme="@style/AppTheme.PopupOverlay">
+             android:id="@+id/toolbar"
+             android:layout_width="match_parent"
+             android:layout_height="?attr/actionBarSize"
+             android:background="?attr/colorPrimary"
+             app:popupTheme="@style/AppTheme.PopupOverlay">
 
         </android.support.v7.widget.Toolbar>
 
+
     </android.support.design.widget.AppBarLayout>
 
+
    <LinearLayout
         android:layout_height="match_parent"
         android:layout_width="match_parent"
@@ -192,4 +201,13 @@
 
    </LinearLayout>
 
-</android.support.design.widget.CoordinatorLayout>
\ No newline at end of file
+</android.support.design.widget.CoordinatorLayout>
+
+    <android.support.design.widget.NavigationView android:id="@+id/nav_view_main"
+        android:layout_width="200dp" android:layout_height="match_parent"
+        android:layout_gravity="start" android:fitsSystemWindows="true"
+        android:background="@color/lightblue"
+        android:layout_marginTop="?attr/actionBarSize"
+        app:menu="@menu/menu_drawer_main" />
+
+</android.support.v4.widget.DrawerLayout>
\ No newline at end of file
diff --git a/app/src/main/res/menu/menu_drawer_main.xml b/app/src/main/res/menu/menu_drawer_main.xml
new file mode 100644
index 0000000..5c5732b
--- /dev/null
+++ b/app/src/main/res/menu/menu_drawer_main.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <group android:checkableBehavior="single">
+        <item android:id="@+id/nav_highscore_main" android:icon="@android:drawable/ic_menu_myplaces"
+            android:title="@string/menu_highscore" />
+    </group>
+    <group android:menuCategory="container" android:title="">
+        <menu>
+            <item android:id="@+id/menu_settings_main" android:icon="@android:drawable/ic_menu_manage"
+                android:title="@string/menu_settings" />
+            <item android:id="@+id/menu_help_main" android:icon="@android:drawable/ic_menu_help"
+                android:title="@string/menu_help" />
+            <item android:id="@+id/menu_about_main" android:icon="@android:drawable/ic_menu_info_details"
+                android:title="@string/menu_about" />
+        </menu>
+    </group>
+
+</menu>
\ No newline at end of file
diff --git a/app/src/main/res/values-w820dp/dimens.xml b/app/src/main/res/values-w820dp/dimens.xml
index 63fc816..4facc4e 100644
--- a/app/src/main/res/values-w820dp/dimens.xml
+++ b/app/src/main/res/values-w820dp/dimens.xml
@@ -3,4 +3,5 @@
          (such as screen margins) for screens with more than 820dp of available width. This
          would include 7" and 10" devices in landscape (~960dp and ~1280dp respectively). -->
     <dimen name="activity_horizontal_margin">64dp</dimen>
+    <dimen name="navigation_separator_vertical_padding">0dp</dimen>
 </resources>